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Experimental and numerical study on fretting wear and fatigue of full-scale railway axles

查看全文 作　　者：Lang [1]Zou;Dongfang [1]Zeng;Yabo [2]Li;Kai [2]Yang;Liantao [1]Lu;Caiqin [1]Yuan 高影响力作者 机构地区：[1]State Key Laboratory of Traction Power,Southwest Jiaotong University,Chengdu 610031,China;[2]CRRC Qingdao Sifang Co.,Ltd,Qingdao 266111,China高影响力机构 出　　处：《Railway Engineering Science》索引2020年第28卷第4期,共17页高影响力期刊 基　　金：the Independent Research Project of the State Key Laboratory of Traction Power(No.2018TPL_Z01);the National Natural Science Foundation of China(No.51375406);the Fundamental Research Funds for the Central Universities(No.2682018CX68). 摘　　要：This study investigated the fretting wear and fatigue of full-scale railway axles.Fatigue tests were conducted on full-scale railway axles,and the fretting wear and fretting fatigue in the fretted zone of the railway axles were analysed.Three-dimensional finite element models were established based on the experimental results.Then,multi-axial fatigue parameters and a linear elastic fracture mechanics-based approach were used to investigate the fretting fatigue crack initiation and propagation,respectively,in which the role of the fretting wear was taken into account.The experimental and simulated results showed that the fretted zone could be divided into zones I-III according to the surface damage morphologies.Fretting wear alleviated the stress concentration near the wheel seat edge and resulted in a new stress concentration near the worn/unworn boundary in zone II,which greatly promoted the fretting crack initiation at the inner side of the fretted zone.Meanwhile,the stress concentration also increased the equivalent stress intensity factor range DKeq below the mating surface,and thus promoted the propagation of fretting fatigue crack.Based on these findings,the effect of the stress redistribution resulting from fretting wear is suggested to be taken into account when evaluating the fretting fatigue in railway axles. 关 键 词：Railway axle Fretting wear Fretting fatigue Crack initiation Crack propagation Finite element
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